Why would they do that? Even though you're not particulary fond of Nobuo Uematsu, you can't deny that his work has been very preponderant on S-E main franchise.
Also, from what we have heard so far from FFXIII soundtrack, Masashi Hamazu has done an excellent work with keeping up with the original spirit and quality of a FF OST.
Also, if you go into S-E second franchise, Koichi Suyigama has done an excellent job as well, you may not like, yet that doesn't take away from the quality.
Oh, and no way I want any other composer on KH music rather than composer goddess Yoko Shinomura
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
